EP2208384B1 - Method and arrangement in a telecommunication system - Google Patents

Method and arrangement in a telecommunication system Download PDF

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Publication number
EP2208384B1
EP2208384B1 EP08863667A EP08863667A EP2208384B1 EP 2208384 B1 EP2208384 B1 EP 2208384B1 EP 08863667 A EP08863667 A EP 08863667A EP 08863667 A EP08863667 A EP 08863667A EP 2208384 B1 EP2208384 B1 EP 2208384B1
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pdcch
subset
group
user equipment
common
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German (de)
English (en)
French (fr)
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EP2208384A1 (en
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Anders Johansson
Leo Hedlund
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Telefonaktiebolaget LM Ericsson AB
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Telefonaktiebolaget LM Ericsson AB
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/535—Allocation or scheduling criteria for wireless resources based on resource usage policies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0038—Blind format detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/009—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location arrangements specific to transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0091—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location arrangements specific to receivers, e.g. format detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower
    • H04W52/0222—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is leader and terminal is follower in packet switched networks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • This invention relates to a method and arrangement in a telecommunication system, and in particular to a method for allocating downlink control channels to user equipments.
  • Evolved UTRAN Evolved UTRAN
  • LTE Long Term Evolution
  • 3GPP 3rd Generation partnership Project
  • PS packet-switched
  • the standard will be based on OFDM (Orthogonal Frequency Division Multiplexing) in the downlink and SC-FDMA (Single Carrier Frequency Domain Multiple Access) in the uplink.
  • one subframe of 1 ms duration is divided into 12 or 14 OFDM (or SC-FDMA) symbols, depending on the configuration.
  • One OFDM (or SC-FDMA) symbol consists of a number of subcarriers in the frequency domain, depending on the channel bandwidth and configuration.
  • One OFDM (or SC-FDMA) symbol on one subcarrier is referred to as a Resource Element (RE).
  • RE Resource Element
  • E-UTRAN no dedicated data channels are used; instead, shared channel resources are used in both downlink and uplink.
  • shared resources DL-SCH (Downlink Shared Channel) and UL-SCH (Uplink Shared Channel) are controlled by one or more schedulers that assign different parts of the downlink and uplink shared channels to the UEs for reception and transmission respectively.
  • the assignments for the DL-SCH and the UL-SCH are transmitted in a control region covering a few OFDM symbols in the beginning of each downlink subframe.
  • the DL-SCH is transmitted in a data region covering the rest of the OFDM symbols in each downlink subframe.
  • the size of the control region is either one, two, three or four OFDM symbols and is set per subframe.
  • PDCCH Physical Downlink Control Channel
  • Control Channel Elements Groups of resource elements that can be used for the transmission of control channels are referred to as Control Channel Elements (CCEs), and a PDCCH is mapped to a number of CCEs.
  • a PDCCH consists of an aggregation of 1, 2, 4 or 8 CCEs.
  • a PDCCH consisting of one CCE is referred to as a PDCCH at aggregation level 1
  • a PDCCH consisting of two CCEs is referred to as a PDCCH at aggregation level 2, and so on.
  • Each CCE may only be utilized on one aggregation level at a time.
  • the variable size achieved by the different aggregation levels is used to adapt the coding rate to the required block error rate (BLER) level for each UE.
  • BLER block error rate
  • the total number of available CCEs in a subframe will vary depending on several parameters, such as the number of OFDM symbols used for the control region, the number of antennas, the system bandwidth, the
  • Each CCE consists of 36 REs. However, in order to achieve time and frequency diversity for the PDCCHs, each CCE and its REs are spread out, both in time over the OFDM symbols used for the control region, and in frequency over the configured bandwidth. This is achieved through a number of operations including interleaving, and cyclic shifts etc. These operations are however predefined, and are completely known to the UEs. That is, each UE knows which resource elements make up each CCE, and is therefore able to decode the relevant resource elements in order to decode any desired PDCCH.
  • the existing system has the disadvantage that, as UEs have no knowledge of where the PDCCHs directed specifically to them are located, each UE has to decode the entire set of possible PDCCHs, i.e. the entire PDCCH space.
  • the entire PDCCH space includes all CCEs on all aggregation levels. This would mean that considerable UE resources are consumed in decoding a large number of PDCCHs, of which only a few were actually directed to them. This will waste the limited UE battery power and hence reduce the UE stand-by time.
  • the CCEs of a control region can be formed into smaller sets of maximum size K CCEs each where the sets are designated as PDCCH candidate search spaces with some amount of overlapping possible between two search spaces.
  • Control information is divided into two parts - shared and dedicated control. Dedicated control information is sent with the data at the beginning of the resource region assigned to the UE.
  • a method of allocating communications resources in a telecommunication system in which the assignments of communications resources to user equipments are transmitted in a plurality of Physical Downlink Control Channels, PDCCH:s.
  • the PDCCH:s are comprised in a control region of each downlink subframe.
  • the downlink control channels, i.e. the PDCCH:s are divided into at least one common subset of the downlink control channels and a plurality of group subsets of the downlink control channels, thereby enabling every user equipment to decode the common subset and only one group subset.
  • the respective group subset of the PDCCH:s to be decoded by a user equipment is determined by modulo counting of a Radio Network Temporary Identifier, RNTI, of the user equipment.
  • RNTI Radio Network Temporary Identifier
  • a method of operation of a user equipment in order to determine communications resources allocated thereto in a telecommunication system in which the assignments of communications resources to user equipments are transmitted in a plurality of Physical Downlink Control Channels, PDCCH:s .
  • the PDCCH:s are comprised in a control region of each downlink subframe.
  • a division of the PDCCH:s into at least one common subset of the PDCCH:s and a plurality of group subsets of the PDCCH:s is determined, and a relevant group subset from the plurality of group subsets is determined.
  • the PDCCH:s forming the common subset or each common subset of the PDCCH:s are decoded, and only the PDCCH:s of the relevant group subset of the downlink control channels are decoded. Furthermore, the step of determining the relevant group subset of the PDCCH:s comprises modulo counting of a Radio Network Temporary Identifier, RNTI, of the user equipment.
  • RNTI Radio Network Temporary Identifier
  • a network node for a telecommunication system in which the assignments of communications resources to user equipments are transmitted in a plurality of Physical Downlink Control Channels, PDCCH:s.
  • the PDCCH:s are comprised in a control region of each downlink subframe.
  • the network node divides the PDCCH:s into at least one common subset of the PDCCH:s and a plurality of group subsets of the PDCCH:s, enabling every user equipment to decode the common subset and only one group subset.
  • a respective group subset of the PDCCH:s to be decoded by a user equipment is determined by modulo counting of a Radio Network Temporary Identifier, RNTI, of the user equipment.
  • RNTI Radio Network Temporary Identifier
  • a user equipment in a telecommunication system in which the assignments of communications resources to user equipments are transmitted in a plurality of Physical Downlink Control Channels, PDCCH:s.
  • the PDCCH:s are comprised in a control region of each downlink subframe.
  • the user equipment is adapted to determine communications resources allocated to it by determining a division of the PDCCH:s into at least one common subset of the downlink control channels and a plurality of group subsets of the PDCCH:s; and determining a relevant group subset from the plurality of group subsets.
  • the user equipment is further adapted to decode the PDCCH:s forming the common subset or each common subset of the downlink control channels, and decode only the PDCCH:s of the relevant group subset of the PDCCH:s. Furthermore, the user equipment is adapted to determine the relevant group subset of the PDCCH:s by modulo counting of a Radio Network Temporary Identifier, RNTI, of the user equipment.
  • RNTI Radio Network Temporary Identifier
  • a subset is defined as a specific set of possible PDCCHs.
  • a common subset is a subset which all UEs shall try to decode.
  • a group subset is a subset which only a limited group of UEs shall try to decode. The exact number of subsets of each type could differ. Also, how these subsets are formed with respect to CCE indices, and aggregation level of CCEs into PDCCHs, could differ.
  • Another problem with subsets is that the pooling gain with one big pool of CCEs is lost when dividing the resources into a number of subsets. If all UEs are assigned to one subset during one subframe, the CCE resources in the other subsets are lost and the system throughput could suffer.
  • the disadvantage of the prior art is at least partially obviated, and these new potential disadvantages are not introduced. It is thus the basic idea of the present invention to reduce the number of PDCCHs that a UE has to decode without introducing severe restrictions leading to problems as described above. This is achieved by dividing the entire set of possible PDCCHs into a number of group and common subsets respectively. Each group subset is decoded by a limited group of 0, 1 or more UEs, whereas the common subset, preferably there is only one, is decoded by every single UE. The formation of the subsets is performed in such a way that neither CCE resources have to be wasted in case of broadcasting nor that CCEs are virtually lost for group subsets where the CCE resources are not utilized.
  • the present invention therefore makes it possible to save UE battery power without preventing the eNodeB from utilising the complete CCE space. Further, the invention allows for an efficient usage of CCEs in case of broadcast messages.
  • FIG. 1 shows a part of a mobile communications network operating in accordance with an aspect of the present invention.
  • This illustrated embodiment refers to a network operating in accordance with the Evolved UMTS Terrestrial Radio Access (E-UTRA) standards defined by the 3GPP organization.
  • E-UTRA Evolved UMTS Terrestrial Radio Access
  • the invention may be applied to any network involving allocation of shared resources on a system downlink.
  • Figure 1 shows a basestation, or eNodeB, 10 in a cell of a cellular network in the form of an Evolved Radio Access Network.
  • the network operates in accordance with a standard based on OFDM (Orthogonal Frequency Division Multiplexing) in the downlink and SC-FDMA (Single Carrier Frequency Domain Multiple Access) in the uplink.
  • Figure 1 also shows four UEs 12, 14, 16, 18 located within the cell served by the eNodeB 10.
  • FIG. 1 illustrates the general form of the eNodeB 10.
  • the eNodeB 10 has radio frequency (RF) interface circuitry 102, connected to an antenna 104, for transmitting and receiving signals over a wireless interface to the UEs.
  • RF radio frequency
  • CN core network
  • the radio frequency interface circuitry 102 and the core network interface 106 operate under the control of a processor 108.
  • the processor 108 is responsible for allocating signals to the available communications resources, which in this illustrative network comprise resources on particular frequency subcarriers during particular time periods.
  • the processor 108 is also responsible for transmitting resource allocation messages to the UEs.
  • One aspect of such control is relevant for an understanding of the present invention, and is described in more detail below.
  • FIG. 1 also illustrates the general form of one UE 12, it being understood that the other UEs are generally similar.
  • the UE 12 has radio frequency (RF) interface circuitry 122, connected to an antenna 124, for transmitting and receiving signals over the wireless interface to the eNodeB 10.
  • the radio frequency interface circuitry 122 operates under the control of a processor 126. This is generally well understood, and will not be described further herein.
  • the processor 126 is responsible for controlling the RF interface circuitry 122, in order to ensure that the intended signals are decoded, and that signals for transmission are applied to allocated communications resources.
  • Figure 2 illustrates the form of one subframe.
  • a subframe of duration 1 ms is divided into 12 or 14 OFDM (or SC-FDMA) symbols, depending on the configuration, and in this example the subframe is divided into 14 OFDM symbols.
  • the available bandwidth is divided into subcarriers, depending on the channel bandwidth and configuration.
  • One OFDM (or SC-FDMA) symbol on one subcarrier is referred to as a Resource Element (RE).
  • RE Resource Element
  • Certain predefined Resource Elements are used for transmitting reference symbols 20.
  • Shared channel resources are used in both downlink and uplink, and these shared resources, DL-SCH (Downlink Shared Channel) and UL-SCH (Uplink Shared Channel), are each controlled by one scheduler that assigns different parts of the downlink and uplink shared channels to different UEs for reception and transmission respectively.
  • DL-SCH Downlink Shared Channel
  • UL-SCH Uplink Shared Channel
  • the assignments for the DL-SCH and the UL-SCH are transmitted in a control region covering a few OFDM symbols in the beginning of each downlink subframe.
  • the size of the control region is either one, two, three or four OFDM symbols and is set per subframe.
  • the size of the control region for a specific subframe is indicated by the Control Format Indicator (CFI) which is carried by the Physical Control Format Indicator Channel (PCFICH) in the very first OFDM symbol of the same subframe.
  • CFI Control Format Indicator
  • PCFICH Physical Control Format Indicator Channel
  • the control region covers the first three OFDM symbols in the subframe.
  • the DL-SCH is transmitted in a data region covering the rest of the OFDM symbols in each downlink subframe.
  • the data region covers the last eleven OFDM symbols in each downlink subframe.
  • PDCCH Physical Downlink Control Channel
  • a PDCCH is mapped to a number of CCEs (Control Channels Elements).
  • a PDCCH consists of an aggregation of 1, 2, 4 or 8 CCEs. These four different alternatives are herein referred to as aggregation levels 1, 2, 4, and 8 respectively.
  • Each CCE may only be utilized on one aggregation level at a time.
  • the variable size achieved by the different aggregation levels is used to adapt the coding rate to the required BLER level for each UE.
  • the total number of available CCEs in a subframe will vary depending on several parameters, such as the number of OFDM symbols used for the control region, the number of antennas, the system bandwidth, the PHICH (Physical HARQ Indicator Channel) size etc.
  • Each CCE consists of 36 REs. However, in order to achieve time and frequency diversity for the PDCCHs, each CCE and its REs are spread out, both in time over the OFDM symbols used for the control region and in frequency over the configured bandwidth. This is achieved through a number of operations including interleaving, and cyclic shifts etc. These operations are however completely known to the UEs.
  • the PDCCH space may be divided, as will be described in more detail below.
  • Figure 3 is a flow chart, illustrating a process performed in the eNodeB, in order to determine whether to divide the PDCCH space into multiple group subsets.
  • the advantage of dividing the PDCCH space into two or more group subsets is most noticeable when there are a large number of CCEs available. This is for two reasons. Firstly, it is mainly when there are a large number of CCEs that there will be a capacity problem in the UE. That is, when there are a large number of CCEs, there are many CCE combinations that, with an undivided PDCCH space, would need to be decoded by the UE, placing a large load on the UE. Secondly, it is preferable to avoid resource fragmentation when there are few CCEs.
  • the process is advantageously performed whenever the number of CCEs may change.
  • the bandwidth, and hence the number of subcarriers in the system could change, which is one of many parameters determining the amount of CCEs and hence in turn the total amount of possible PDCCHs.
  • the size of the control region i.e., the number of OFDM symbols used for it, is also an important parameter for determining how many PDCCHs are possible in total. Since this could vary from one subframe to another, the division of the PDCCH space should preferably also vary on a subframe basis. This can be achieved by performing the complete process once per subframe. Alternatively, if the number of different possible divisions of the PDCCH space is not too large, the possible divisions could be determined at startup of the eNodeB and then stored for all combinations of bandwidth and control region size, and any other relevant parameters.
  • step 30 of the process illustrated in Figure 3 the number of available CCEs is determined and, in step 32, this number is compared with a threshold number. If the number of available CCEs does not exceed the threshold number, the process passes to step 34, in which it is determined that an undivided PDCCH space should be used.
  • the threshold number of CCEs, below which the undivided PDCCH space is used may for example be set to about 10 or 15 CCEs. In this case, for example, every UE must decode every possible PDCCH.
  • the eNodeB is then able to transmit PDCCHs to UEs, for example containing resource assignment messages, using this undivided PDCCH space.
  • step 32 If it is determined in step 32 that the number of available CCEs exceeds the threshold number, the process passes to step 36, in which it is determined that a divided PDCCH space should be used, as will be described in more detail below.
  • the eNodeB will be able to transmit PDCCHs, for example containing resource assignment messages, to UEs as shown in step 38, again as will be described in more detail below.
  • Figure 4 is a flow chart, illustrating a process performed in a UE, preferably in each subframe, in order to determine which part of the PDCCH space it must decode.
  • the number of available CCEs is determined. Specifically, the UE should calculate the number of CCEs for each subframe.
  • the number of CCEs in each subframe can easily be calculated from the PCFICH indicator, the configured bandwidth, PHICH size and duration, number of antennas etc. All of these, except the PCFICH, are assumed to be semi-statically configured.
  • the UE determines from the calculated number of CCEs in each subframe whether group subsets are used or not. For example, as described above with reference to Figure 3 , the number of CCEs in each subframe can be compared with a threshold number. This threshold number must of course be the same as the threshold number used by the eNodeB in step 32.
  • the threshold number can be predefined, and stored in the eNodeB and the UE, or it can be signaled from the eNodeB to the UE, for example in RRC signalling.
  • step 54 in which it is determined that the UE must decode every possible PDCCH.
  • step 56 the process passes to step 56, in which the UE determines which group subset to decode. More specifically, the UE should know by some implicit mapping or signaling which group subset to decode. There are several straightforward methods that could be utilized to achieve an implicit mapping. One example is modulo counting of the Radio Network Temporary Identifier (RNTI) of the UE, in order to determine the starting location for the group subset. Of course, the UE must use the same method that was used in the eNodeB to allocate UEs to group subsets.
  • RNTI Radio Network Temporary Identifier
  • step 58 the UE decodes the PDCCHs in the relevant group subset, determined in step 56, and in the common subset.
  • the number of available CCEs is above a threshold value, and it is decided to divide the PDCCH space, there are at least two group subsets. It may be advantageous that the number of group subsets that are used grows beyond two with an increasing total number of available CCEs, although the number of group subsets may not grow in direct proportion with the total number of available CCEs.
  • Figure 5 shows the available CCE resources at one particular time, by way of example.
  • CCEs each having a respective CCE index, as shown along the horizontal axis in Figure 5 .
  • These CCEs can be combined with different aggregation levels, as is known.
  • Figure 5 shows the CCEs 70 with the lowest aggregation level of 1, but also shows the CCEs in aggregations 72 with an aggregation level of 2, in aggregations 74 with an aggregation level of 4, and in aggregations 76 with the highest aggregation level of 8.
  • the PDCCH space includes all CCEs on all aggregation levels.
  • one common subset is defined, in addition to the group subsets mentioned above. This subset of PDCCHs is then mandatory for all UEs to decode.
  • the common subset is defined to contain certain CCEs at a certain aggregation level.
  • the common subset may advantageously be formed to cover the largest possible PDCCH size, i.e. 8 CCEs in the example shown in Figure 5 .
  • the common subset By defining the common subset as all possible PDCCHs on aggregation level 8, more or less the whole CCE space can be covered with a small set of PDCCHs, and so all CCEs are enabled for use by any UE without forcing each UE to decode a large number of PDCCH candidates.
  • the common subset to include possible PDCCHs on lower aggregation levels, more decodings by the UE would be required in order to cover a certain CCE space..
  • Group subsets may for example be formed to cover a certain set of CCE resources corresponding to certain CCE indices.
  • the possible PDCCHs within each group subset are then defined by the possible aggregations into PDCCHs from the CCE indices defined as resources for that group subset. All possible PDCCHs on all aggregation levels (i.e., 1, 2, 4, and 8) for all CCE indices of the group may then be defined to be part of that specific group subset.
  • the common subset or each common subset will be decoded by every UE, and each group subset will be decoded only by a limited group of UEs.
  • one group subset is defined to cover all possible PDCCHs on all aggregation levels (i.e., 1, 2, 4, and 8) for all CCE indices in the range from i1 to iN.
  • This group subset therefore covers certain CCE indices, namely from CCE index i1 to iN, on each of aggregation levels 1, 2, 4, and 8.
  • a group subset may be defined such that it contains CCEs at one aggregation level that do not overlap with the CCEs at a different aggregation level.
  • a group subset may be defined so that it covers a first set of CCEs at aggregation level 8 extending over the first half of the range from i1 to iN (i.e. from i1 to i[N/2] and a second set of CCEs at aggregation level 4 extending over the upper half of the range from i1 to iN (i.e. from i[N/2 + 1] to iN).
  • a common subset is utilized for broadcast messages. Since, in the illustrated embodiment, the common subset includes the PDCCHs containing the larger number of CCEs, these are well suited for broadcast messages which typically need to cover the whole cell. By utilizing the common subset for broadcasting, huge savings are achieved in terms of CCE resources, since the same assignment would otherwise have to be sent in many different group subsets and in each of them probably occupy a large number of CCEs in order to cover the cell.
  • the definition of the common subset allows messages to be allocated to PDCCHs in an efficient manner.
  • the most expensive PDCCHs i.e., the PDCCHs containing many CCEs
  • PDCCHs which are part of the common subset can be moved to PDCCHs which are part of the common subset.
  • PDCCHs which are part of the common subset.
  • a group subset is defined in such a way that it contains CCEs at one aggregation level that do not overlap with the CCEs at a different aggregation level
  • a PDCCH requiring a low aggregation level for example aggregation level 2
  • a higher aggregation level for example aggregation level 4

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